1,-2,3,-4,5,-6 ••••••2004 根据上述规律,计算这2004个数的和

问题描述:

1,-2,3,-4,5,-6 ••••••2004 根据上述规律,计算这2004个数的和
1,-2,3,-4,5,-6 ••••••-2004 根据上述规律,计算这2004个数的和打错了是-2004

1+(-2)+3+(-4)+……+2003+(-2004)
=(1-2)+(3-4)+……+(2003-2004) 共1002组
= -1×1002
= -10021\2,-1\2,-3\2照规律,填出后两个数三个数?1/2、-1/2 、-3/2?1.-3,-5,-7,-9,-112.-3,-6,-9,-12,-153.就是1\2,-1\2,-3\2照规律,填出后两个数1.-3,-5,-7,-9,-11-13-15 连续减去22.-3,-6,-9,-12,-15-18-21连续减去33、1\2,-1\2,-3\2-5/2-7/2 连续减去1